dsfr_kickstart-2.1.x-dev/web/sites/settings.local.php

<?php

$settings['config_sync_directory'] = '../config/sync';
$settings['file_private_path'] = '../private';

# $config['config_split.config_split.prod']['status'] = TRUE;
# $config['config_split.config_split.preprod']['status'] = TRUE;
# config['config_split.config_split.dev']['status'] = TRUE;
# $config['config_split.config_split.local']['status'] = TRUE;